Reinforced concrete construction.



C. A. P. TURNER.

REINFORCED CONCRETE CONSTRUCTION.

AAA

APPLICATION FILED IULYI8, I9II.

- and material used.

CLAUDE A. P. TURNER, 0F MINNEAPOLIS, MINNESOTA.

REINFORCED CONCRETE CONSTRUCTION.

, 1,173,9CL I Specification of Letters Patent.

Patented Feb. 29, 1916.

Application filed July 18. 1911. Serial No. 639,179.

T 0 all whom it may concern:

Be it known that I, CLAUDE AP. TURNER, of Minneapolis, in the county ofHenn-epin, and in the State of Minnesota, have invented a certain.newand useful Improvement in Reinforced Concrete Construction, and dohereby declare that the following is a full, clear. and exactdescription thereof. The object of my invent-ion is to provideimprovements in the construction of long span concrete floors for lightloads, more particularly, so that there shall be economy, both inrespect of the operations involved The minimum, practical ratio' ofthickness of slab to span is inimical to economy in the use of solidslab construction for longspans and light loads. Various expedients havebeen resorted to, to overcome this difficulty, such, for example, as theuse of hollow tile placed between thin concrete ribs with a layer ofconcrete on top, and the use of a bottom and top layers of concrete, andtile between. By my invention I secure the desired. light weight withoutthe expense of tile, and to this end, generally stated, I produce acellular body or slab of concrete comprising a thin lower membersuitably reinforced, inverted, reinforced beams, extending therefrom,between which are the cells or spaces, and a satisfactory, butinexpensive filling for the cells, such as cinders. the accompanyingdrawings-Figure 1 is a top plan view of a portion of a span constructedin accordance with my invention; Fig. 2 is a vertical section thereof;Fig. 3 is a detail verticalsection on the line 3-3 of Fig. 2; Fig. l isa similar view on the line H of Fig. 2; and Fig. 5 isa vertical sectionthrough the forms or centering that I employ. v

In carrying my invention into practice, simple-centering 10 extendinghorizontally between the structure walls 11, is erected,

forcement the form of two series of oband comparatively small coflinboxes 12 each of the external dimensions of the cell to be formed, assupported above the centering 10 by spools 13 or other spacing devices,so that, between said boxes and centering a space equal to the desiredthickness of the lower slab like layer is provided. Reinliquely, ordiagonally placed rods 1 L form- 1ng a cries-cross arrangement havingprev1ou sly been laid in said space, and reinforcing rods 15 run betweenthe opposite walls 11, in parallel groups to provide the beamreinforcement, the concrete is poured, so that it fills the spacesbetween the centering 10 and the bottoms of the boxes 12, and betweenthe sides and ends of the latter, so that when the boxes are removed, acellular formation of reinforced concrete exists composed of the bottomslab-form member 16 through which the criss-cross arrangement of rods 14extends from support to support; the parallel reinforced concrete beams17, and the concrete ribs 18 extending cross- WiSe of the beams 17.- Inthe cells or spaces thus provided, a filling of cinders 19 or otherinexpensive material is placed, and over the top'cf the whole, aflooring of wood or terrazzo may be placed. As the diagonally orobliquely arranged reinforcements that traverse the slab intersect, orpass through a series or number of beams or ribs, the advantageous fiatplate action is secured, and this is so eiiicient, that in some cases,it renders unnecessary the use of beam, or rib, reinforcement. Thecofiin boxes may beremoved after'the concrete has had a few hours .toset, so that they can thus quicklybeused in another part of the floor,and, hence, the number of boxes or forms required in actual use may besmall and, thus, an item of expense'saved.

Having thus described my invention What I claim isi 1. In a long spanslab construction, the combination ofa cellular fiat slab of concretewith diagonal lines of reinforcement consisting of rods runningiinstraight linesthrough the lower portion, the cellular formationconsisting of main parallel reinforced concrete beams of the invertedtype running from support to support, stiffened transversely by ribs ofconcrete at con venient intervals, the diagonal reinforcement extendingin two directions and obliquelly to the direction of the parallel beam.

long span slab construction, the combinatwn of a cellular flat slab ofconcrete with diagonal lines of reinforcement consisting of:rodsrunnin'g in straight lines through the lower portion, the cellularformation consisting-0f main parallel reinferced concrete beams of theinverted 'type Running from support to support, stifi'ened transverselyby ribs of concrete at -c0'ny venien't intervals, said parallel beamshaving longitudinal reinforcement, the diago-v p221 reinforcementextending in two direc- CLAUDE A. P. TURNER. Witnesses: i

. GHAs. J. WILLIAMSON,

A. T. HAYES.

